The authorities want to evaluate the oxygen level "C" (mg/L) in one of its rivers, where there are wastewater discharges. The oxygen level is governed by the following equation: C = 10 - 20[e-0.15x - e-0.5x]

Use Newton Raphson's method to determine the distance in which the oxygen level reaches a reading of 5mg/L. The distance will be determined as X measured in km. The initial value is:

X₀= 0

Please note that the function f(x) must be generated from the equation "C", for that you can then calculate the first derivative of the function and apply the method.